Bench type honing machine



Oct. 4, 1949. w. F. MlTCHELL BENCH TYPE HONING MACHINE 4 Sheets-Sheet 1 Filed Dec 5, 1945 L. INVENTOR.

53 mulmnn R km Oct. 4, 1949. w. F. MITCHELL 2,433,590

BENCH TYPE HONING MACHINE Filed Dec. 5, 1945 4 Sheets-Sheet 5 Oct. 4, 1949. w MI 2,483,590 I BENCH TYPE HONING MACHINE Filed Dec. 5, 1945 A SneetS-S eet 4 IN V EN TOR.

wallaceffidzfiell, BY? .2 r

Patented Oct. 4, 1949 UNITED STATES PATENT OFFICE BENCH TYPE HONING MACHINE Wallace F. Mitchell, Chicago, Ill., assignor to Ammco Tools, Inc., a corporation of Illinois Application December 5, 1945, Serial No. 632,908

(Cl. 51 -v2) 12 Claims. 1

The invention relates to so-called bench type honing machines. While it may be utilized with hones of various sizes, the structureillustrated is particularly adapted for the driving and feeding of small bore hones.

One of the objects of the invention is to provide an improved device of this character which is substantially foolproof in operation and will operate the hone with a maximum degree of efiiciency.

Another object of the invention is to provide a device of the character above described which is of very simpl construction, embodies a minimum number of parts, occupies only a very small space, and may be manufactured and sold cheaply, and one which is sufiiciently strong and durable to ive eificient service over a long period of time.

A further object is to provide a bench type honing machine which may be readily and easily operated and adjusted for the honing operation without the necessity of using skilled labor.

Another object of the invention is th provision of a housing which not only encloses the operating mechanism but also provides storage for the parts of the hone such as the mandrels and stones. 1

Another very important object is to provide a honing machine having instant starting and stopping operation. This is highly important from the standpoint of stopping because it eliminates marring of the finished product by the hone. It is highly desirable that in a device of this kind there be no coasting of the tool after the honing operation is completed to prevent marring of the hone surface with its subsequent disadvantages.

A further object of the invention is to provide an automatically engageable friction clutch for connecting the power drive mechanism to rotate the hone, a manually controlled lever for controlling said clutch and stone feed mechanism also connected to said lever for feeding the stones radially outwardly to the desired extent after the clutch has been engaged, said feed mechanism having adjusting means to determine the extent of outward movement of the stones.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings:

Figure 1 is a front elevation view of a honing machine embodying the invention, the operating treadle being omitted and parts being broken away;

Fig. 2 is a side elevation view of the machine shown in Fig. 1;

Fig. 3 is a vertical sectional view taken along the line 3-3 of Fig. 1;

Fig. 4 is a vertical sectional view taken along the line 4-4 of Fig. 3;

Fig. 5 is a detailed vertical sectional view along the line 5--5 of Fig. 3;

Fig. 6 is a horizontal sectional view taken along the line 66 of Fig. 4;

Fig. '7 is a vertical sectional view taken along the line l! of Fig. 6.

The machine embodying the invention is designed to take any suitable hone N) (Fig. 2) which usually includes a mandrel II and stones I2 with means, usually wedge connections, between a reciprocatory member and the stones for moving the stones radially outwardly to the desired amount to produce the finished bore in the part to be honed. As the particular form of the hone constitutes no part of the present invention, further description of the hone is not deemed necessary, but for one form of expansible hone that may be used on this machine reference may be had to my copending application Serial No. 615,165, filed September 8, 1945 now Patent No. 2,445,277, dated July 13, 1948 for Hone. The machine herein provides the power for rotating the bone and for controlling and moving the wedge operatin member of the hone.

The machine includes a housing l3 (Fig. 1) having a base l4, and front, back and cover plate portions I6, l1, and I8 bolted thereto. The sides of the housing are provided with doors l9 (Figs. 4 and 6) suitably hinged, as by gravity type hinges, to the-front and back plates, which doors are provided with shelves forming storage compartments for the parts of the hone such as the mandrels and stones, the mandrels being carried on one of the doors and the stones on the other door. The housing I3 is designed to completely enclose all the operating mechanism.

The hone I 0 is carried by a hollow shaft 2| (Fig. 3) in which a hone expanding member 22 is slidably mounted. Shaft 2! has a head portion 23 secured by a set screw 24 to a drive adapter 25.

The drive adapter 25 (Fig. 3) is secured by a threaded connection 26 to a hollow hone drive spindle 21 in which a feed operating and control rod 28 is freely and slidably mounted and normally urged toward the left, as viewed in Fig. 3, by a spring 29 interposed between a shoulder 30 on the spindle 21 and a head member 3| provided with a reduced outer end 32 having a bearing race therein. The spindle 21 is journalled in spaced bearings 33 in a supporting housing 3% secured at its front end in the front plate Iii and is prevented from lengthwise movement by the rear shoulder of the adapter 25 engaging the 'front end of said housing 34 and a collar 35 locked by screw 36 to the spindle and engaging th rear end portion of the housing 34,

For driving the spindle 21, a drive pulley 31 is mounted for free rotation thereon and is adapted to be connected thereto by a friction ;member 50 and the spindle collar 35.

clutch. Drive pulley 31 is connected by a V- belt 38 with a pulley 39 on the drive shaft 49 of .an electric motor 4| whose circuit connections 'the housing and maintaining the proper tension in the belt 38, the .base oi the motor isv to expand the hone.

mounted on a saddle 44 (Fig. 40. pivotally mounted on a horizontally disposed shaft 45 fixed to the back plate ll. Saddle- 44, at a point offset from its pivotal mounting, engages a tensioning screw 46 adiustably mounted in the The friction clutch for connecting the pulley 31 with the spindle 21 includes friction elements "48 (Fig. 3) of leather or other suitable material secured to the faces of the hub of said pulley, one of which is engageable with a collar 49 fixed to the spindle H and the other of which engaged by a shiftable. clutch sleeve 01: member. 50. slidably mounted. on the spindle 21 but drivingly connected thereto by a keyed connection 5| therewith.- The member 50 is constantly urged intoclutching connection with the pulley 31' by a spring 52 interposed between The shifting of the member 50 is under the. control of the operator through. a treadle operated lever 53 operatively connected. atone end with member 50 (Figs. 4 to. 7, inclusive) and. at its other end with a pedal operated link 54 (the pedal not being shown). The lever 53 is nor- .mally held in its upper position. by a. tension spring 55 (Fig. 3) whose loading is greater than that of. the spring 52,. so that. the spring 52 can- :not function to shift-the member 501 to clutch engaging position. until the operator by a. downward movement of the treadle. and lever 53 nulrlifies or counteracts the tension of the spring. 55.

This. same movement of the lever 53 is used. for

moving the feed rod 28 to expand the hone and is accomplished, as follows: 7

The support 34- for the spindle 21' has bifurcations 56- (Figs. 5 and. (i) apertured toreceive pivot pins 51 in the form of socket head formed by pin: extensions of the bolts 59 and other bolts 62. One set 60 of these pivots is-disposed in a plane passing through the. axis of the spindle 2 1 and carries a half collar 53- (Figs.

3 and 5) mounted in an annular groove- 64 in the clutch member 551 and held'thereagainst in. -clutch throw out position by the lever spring 55.

The other set 6! of the pivots is mounted in the 'lowerend of a'T-shaped member 65 (Figs, 3, 4 and 5) whose upper end has a bore- 66" to receive a settable feed regulating shaft or rod 61 (Figs. 3, 6 and 7) and is secured" against llengthwise movement relative thereto by collars 68 clamped to said shaft. The shaft 81 is adjusta-bly mounted in an overarm member 69 having a. rearward depending arm portion [0 carrying a radial thrust bearing H; whose inner race engages the outer end ball race. end 3.2 of

rod 25. Downward movement'of the lever 53 "moves the collar 63 rearwardly and out. of con- 4 tact with the member 50 to allow spring 52 to engage the clutch to drivingly connect the pulley 31 with the spindle 21 and at the same time moves the member 5.5-, shaft 6-! and. arm 69 forwardly'or toward the right and thus moves the rod 28 against the pressure of the spring 29 Varying the position of rod 61 and consequently the position of the member 55 relative to the arm 69 will, therefore, vary the stroke of the rod 28 and consequently the radial movement of the stones.

In order to position the stones l2 of the hone H1 in operating contact with work having different sizes. of bores and vary the stroke of rod 28 and hence the amount of radial outward movement of the stones l2, the shaft 6'! which extends throughv bosses 12 in the member 69has a threaded portion 13 in threaded'engagement with the front boss 72 and has a cylindrical shank portion 14 slida'bly'mounted in and carrying a pin 15 extending through diametrically disposed slots 76 in the sleeve portion 1T of a settable member 18- whose shank. 7.9T extends through. a bearing 88 in the front plate 161 and has a suitably indexed adjusting dial 81 (Figs. 1 to 3,. inclusive). secured. to itsouter endby a screw 82 and provided with a hand wheel. or knob 83. The main divisions of the. scale mark.- ings 84 on the dial. may be graduated to read in ten-thousandths and the other divisions in fractional parts of ten-thousandths and are adapted. to cooperate with a fixed indicator point 85 on the front plate. Turning the. dial 8| will, through the slidable but non-rotatable connection between the member It and shaft: 61, turn this shaft to move the arm 69 to the left or the right and hence determines the amount of longitudinal movement that may be imparted to the rod. 28 on the downward movement of the lever 53' which in its lower position engages a fixed stop 35 formed by the lower end or the slot 86 in the: front plate I-S;

With the above construction; depressionxof the lever 53' throws in the drive clutch, and. at the same time, through the parts above described moves the feed rod 28: toward:v the: right to. expand the stones an amount predetermined. by the adjustmentv of the stroke of'said rod through the adjustment of the feed; regulating shaft 61, but in addition for the initial setting of the-stones and for any desired further small movement of the stones after the pedal is depressed, the operator by turning the knob 83 tothe right may through the connections described move the feed rod 28 further to the right tov expand the stones to bring the bore to thedesired diameter.

In operation the hone 19' is first attached to the drive adapter 25, and. in doing. this the rod 28 is operatively engaged with the wedge.- operating member 22, so that upon moving of the rod 28 to the right the stones will be moved radially outwardly. At this time the motor switch 42 is in the off position... To adjust the tool for the honing of a bore ot a particular size,

' the foot pedal and in turn the lever connected thereto is fully depressed until the: latter engages the bottom of the slot 85 in the front plate 16 which serves as a foot pedal stop 86a.

The knob 83 is then rotated to the right to move leased, and having determined approximately at least the amount of material to be ground from the bore in the honing operation, the knob 83 is further turned to the right to move the arm 69 and shaft 28 further to the right to an extent corresponding to the amount of material to be removed. Thereafter with the pedal in a re leased position and the hone positioned in the bore, the machine is started b throwing in the switch Q2 and the lever 53 is depressed. A slight depression of the foot pedal throws in the clutch and causes the stones to rotate and at the same time engages the stones with the bore and the honing operation begins.

Continued pressure on the foot pedal will tend to constantly expand the stones to the full limit of the adjustment made until the lever 53 strikes its stop 86a at which time the honing operation has been carried out to the extent of the adjustment made less, of course, th wear of the stones which may be compensated for by observation and additional adjustment through a slight movement of the knob 83 by the operator. With this arrangement after having determined the amount of adjustment necessary to remove a given amount of material in respect to the first piece of work operated upon, substantially the proper adjustment may b made in subsequent operations, so that subsequent pieces of Work may be honed with the single adjustment of the tool.

There may be times when the operator will find it desirable to adjust the extent of expansion of the hone during operation. In that case he may do so while the machine is running and while the lever 53 is depressed by rotating the knob 83 to the desired extent.

It will be noted from the foregoing that the stop 85a formed by the bottom of the slot 86 in which the lever 53 moves serves as a definite stop or limiting means for the end of adjustment under all adjustment conditions. I'he initial adjustment is set when the lever 53 is in depressed position, and that being the case, the range of adjustment from beginning to end of the honing operation is determined by the extent of depression of the lever 53 as governed by the depth of the slot 86.

I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except insofar as such limitations are included in the claims.

I claim:

1. In a honing machine adapted for supporting and operating an expansible hone, the combination with a rotatable hone drive spindle, of a drive member normall mounted for free rotation thereon, an automatically engageable clutch for drivingly connecting said member with said spindle, a reciprocatory feed rod for expanding the hone, means including a feed adjusting member for moving said feed rod to expand the hone, and an operator controlled means operatively connected to said clutch and said feed rod moving means and adapted in its inoperative position to hold said clutch disengaged.

2. In a honing machine adapted for supporting and operating an expansible hone, the combination with a rotatable hone drive spindle, of a drive member normally mounted for free rotation thereon, an automatically engageable clutch for drivingly connecting said member With said spindle, a spring retracted feed rod adapted for expanding the hone, means including a feed adjusting member for moving said feed rod to expand the hone, and means including a lever operatively connected to said clutch and said feed rod moving means and adapted in its inoperative position to hold said clutch disengaged.

3. In a honing machine adapted for supporting and operating an expansible hone, the combination with a rotatable hone drive spindle, of a drive member normally mounted for free rotation thereon, a friction clutch for drivingly connecting said member with said spindle, yieldable means urging said clutch into driving engagement, a reciprocatory feed rod for expanding the hone, means including a feed adjusting member for moving said feed rod to expand the hone, an operator controlled lever normally retracted and operatively connected to said clutch to disengage the same and normally hold it disdisengaged, yieldable means'for holding said lever normally retracted, said lever being operable upon movement thereof from its retracted position to engage said clutch and also being oper atively connected to said feed rod moving means to move the same to expand the hone when said clutch is engaged.

' 4. In a honing machine adapted for supporting and operating an expansible hone, the combination with a rotatable hone drive spindle, of a drive member mounted thereon for rotation relative thereto, an automatically engageable clutch for drivingly connecting said member with said spindle, a reciprocatory feed rod for expanding the hone, an overarm in thrust engagement with said rod to move the same to expand the hone, a manually settable feed adjusting member having a threaded connection with said overarm, and a clutch control member connected to said adjusting member to move the latter and in turn said overarm when said control member is actuated to engage said clutch.

5. In a honing machine adapted for supportin and operating an expansible hone, the combination with a rotatable hone drive spindle, of a drive member, an automatically engageable clutch for drivingly connecting said drive member with said spindle for rotating the latter, a spring retracted reciprocatory feed rod for expanding the hone, an overarm in thrust engagement with said rod to move the same to expand the hone, a feed. adjusting member having a threaded connection with said overarm, an operator controlled spring retracted lever, a releaseable connection between said lever and clutch to hold said clutch in disengaged position when said lever is retracted, and a connection between said lever and said feed adjusting member to move the same on release of the connection between said lever and clutch.

6. In a honing machine adapted for supporting and operating an expansible hone, the combination of a housing, a rotatable hollow hone drive spindle extending into said housing, a journal support for said spindle mounted in said housin a drive pulley mounted on said spindle for free rotation relative thereto, a friction clutch for connecting said pulley with said spindle including a 'shiftable clutch member, a spring interposed between said clutch member and said journal sup port, a lever having a head portion pivotally mounted on said journal support and having a member pivotally connected thereto and engageable with said shiftable clutch member, means for tensioning said 1ever to overcome the tension of said first named spring to hold the shiitable clutch member in a released position, a reciprocatory feed rod extending through the hollow of said drive spindle for expanding the hone, a spring for moving said rod to a retracted position, an overthrust-engagement with said rod to move the same againstthe, pressure of said spring to expand the hone, aieed adjustingshaft having a threaded connection with said overarm, a member pivotally connected to the head member of said lever and secured to said feed adjusting 7 member whereby said overarm operates to saidfeed rod when and after said lever: moved to permit said first named spring to engage said clutch.

7. In a machine of the character described, an

"expansible and contractible tool for sizing. bores,

a rotatable spindle for supporting and driving said tool, means for controlling the expansion and contraction of said tool, drive means normally disconnected from said spindle, means shiftable along said spindle for connecting said drive means with said spindle to rotate the latter and said tool, and operator-controlled means for simultaneously actuating said shiftable means and said controlmeansto cause said drive means to rotate said spindle and tool and to expand said tool, respectively, said operator-controlled means having a lost-motion connection with said shiftabl'e means providing for further actuation of said control means independently of said shiftable means after connection of said drive. means with said spindle.

8'. In. a machine adaptedfor supporting and operating an expansible tool for sizing bores, a

rotatable tool drive spindle, a, drive member for said spindle mounted; for rotation normally independently of said spindle, a clutch having a predetermined maximum driving effort when fully engaged operative to: drivingly connect said drive 0.)

member with said spindle, means for expanding the tool, and operator-controlled means operatively connected to said clutch and to said tool expanding means, respectively, for simultaneously efiecting engagement of said clutch and actuating 7 said: spindle mounted for rotation normally in dependently of said spindle, a clutch mounted on said spindle and operative: for drivingly connecting said drive member with said spindle, said clutch; having a predetermined maximumdriving eii'oitwhen fully engaged, means for expanding the tool, clutch actuating means including a member shiftable along said spindle for sheeting engagement of said clutch, operator-controlled means operatively connected to said clutch actuating means and to said tool expanding' means, respectively, for simultaneously effecting; engagement of said clutch and actuating said expanding means to expand the. tool, and operative. to expand the tool beyond the extent: of' expansion thereof effected. when said operatorcontrolled means. is actnatedijto effect full engagement of said clutch, and means. normally maintaining. said operator-controlled means in I inoperative position with said. tool expanding means inoperative and said clutch disengaged;

10;. In a machine adapted for supporting and operating an expansible tool for sizing bores, a rotatabletool drive spindle, a drive member for said spindle. mounted for rotation normallyindependently of said spindle, a clutch operative when engaged for drivingly connecting said drive member with said spindle, a spring urging said clutch into engaged condition, a reciprocatory feed device for expanding the tool, a spring urging said feed device into retractedposition, means including a feed adjusting member for advancing feed device toaexpand the tool, a clutch actuating member for effecting engagement of said clutch,- operator controlled means operatively connected to said, clutch actuating member and to saidfeed adjusting member, respectively, for simulltaneouslyeffecting engagement of said clutch and advancing said feed device to expand said bone, and a spring stronger thansaid first spring and yieldingly urging said operator-controlled means into inoperative position with said feed device retracted and said clutch disengaged.

11. In a machine adapted for supporting and operating an expansible tool for sizing bores, a rotatable tool drive spindle, a drive member for said spindle mounted for rotation normally independently of said spindle, a clutch for drivingly connecting said drive member with said spindle, a reciprocatory feed member for expanding the tool, means including a reciprocatory feed adjusting member and a thrust member carried rigi 1y thereby for translational movement therewith and in thrust engagement with said feed member for advancing said feed member to expand the tool, a clutch actuating member for effecting engagement of said clutch, and operator-controlled m ans operativel'y connected to clutch actuating member and to said feed adjusting member, respectively, for simultanecusly effecting engagement of said clutch and advancing said feedmember.

12. A machine of the character described.com prising an expansible and contractible tool for sizing bores, a rotatable spindle supporting and driving said tool, means for expanding and: contracting said tool while said spindle is rotating which includes a tool expanding device passing along said spindle and connected with said tool, an adjustable expansion control element shiftable in a plane parallel with the axis of said spindle, and an element connecting said expanding device with said shiftable expansion control element and translatable in apath parallel with the axis of said spindle, drive means normally disconnected from said spindle, means shiftable along said spindle for connecting said drive means with said spindle to rotate the latter, and operator-controlled means for simultaneously shifting said expansion control element and said shiftable means for actuating said tool expanding and contracting means and said drive-connecting means to cause said expandingand contracting means to expand said tool and said spindle to be driven rotatably, respectively.

WALLACE F. MITCH-ELL.

REFERENCES CITED The following references are of record in the file of this patent: 

